mccarty



W. F. McCARTY.

MULTIPLE SPINDLE DRILLING MACHINE.

APPLICATION FILED DEC-6, 1919.

Patented J une 21, 1921.

8 SHEEIFSHEEI IIPII WITNESSES A TTORNE Y8 W. F. McCAR'IY.

MULTIPLE SPINDLE DRILLING MACHINE.

APPLICATION mm DEC-6. 1919.

1,382Q434. Patented June 21, 1921.

8 SHEEN-SHEET 2- unT Tw --------unumllll"""HW in WITNESSES V glLll -lnll INVENTOR mat-Mammy 21 a1 W ATTORNEYS F. McCARTY.

MULTIPLE SPINDLE DRILLING MACHINE.

' APPLICATION HLED DEC.6. I9l9. 1,382,434. Patented June 21, 1921.

8 $HEETSSHEET 3- A TTORNEYS OI 3 3 I02 g WITNESSES W. F. McCARTY.

1 ML nu mum MULTIPLE SPINDLE DRILLING MACHINE.

APPLICATION mm DEC.6.1919.

Patented J une. 21, 1921.

8 SHEETS-SHEET 4.

.nulbl 'IHHIIIHIII INVENTOR A TTORNEYS W. F. McCARTY.

MULTIPLE SPINDLE DRILLING MACHINE.

APILICAYION FILED DEC.6, 1919. 1,382,434, Patented June 21, 1921.

\\\\7 H I! vul f INVENTOR William JJIFCarty A TTORNEYS W. F. McCARTY.

MULTIPLE SPINDLE DRILLING MACHINE.

APPLICATION FILED 9506,1919.

1,382,434, Patented June 21, 1921.

8 SHEETSSHEET 6.

W. F. McCARTY.'

MULTIPLE SPINDLE- DRILLING MACHINE.

APPLICATION FILE-D Dec. 6, 1919.

Patented June 21, 1921.

8 SHEETSSHEET I.

INVENTOR William dil ary A TTORNEYS W. F. McCARIY.

MULTIPLE SPINDLE DRILLING MACHINE.

APPIICAZION FILED DEC.& 1919.

1,382,434. Patented June 21, 1921.

FAST DOWN 9 Q Q o WITNESSES 3 3 I mvznron W c O 0 0 William sfJmbrg w I O 0 8y O o nrronuns UNITED STATES PATENT OFFICE.

WILLIAM F. MGCAIRT'Y, OF DEFIANCE, OHIO. ASSIGNOR TO DEFIANCE MACHINE WORKS, OF DEFIANCE, OHIO, A CORPORATION OF OHIO.

HULTIPLE-SPINDLE DRILLING-MACHINE.

Specification of Letters Patent.

Patented June 21, 1921.

To all wlwm it may concern.

Be it known that I, \VILLIAM F. MCCARTY, a citizen of the United States, and a resident of Defiance, in the county of Defiance and State of Ohio, have invented a new and Improved Multiple-Spindle Drilling-Machine, of which the following is a full, clear, and exact description.

The invention relates to metal working machines and its object is to provide a new and improved multiple spindle drilling machine of inclosed unit construction and designed for simultaneously carrying on a number of drilling operations.

Another object is to provide an automatic quick advance, slow work feed and a quick return of the drill spindles, thus insuring a high speed production without requiring attention on the part of the attendant except for the latter to place the work in position, to start the machine, and to remove the work after it is finished.

Another object is to permit of arranging the drill spindles in a straight line or in a cluster or with a group of universally adjustable spindles arranged in a straight line, a rectangular or a circular cluster.

\Vith these and other objects in view, the invention consists of certain novel features of construction, as hereinafter shown and described and then specifically pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is an elevation of the right-hand side of the improved multiple spindle drilling machine with the parts shown in section:

Fig. 2 is a front elevation of the same;

Fig. 3 is an enlarged sectional plan view of the same on the line 33 of Fig. 1;

Fig. 4 is an enlarged cross section of the spindle head;

Fig. 5 is a plan view of the same with the cover removed and the feed section and the driving shaft shown in section;

Fig. (i is an enlarged sectional elevation of the hand feed mechanism;

Fig. 7 is an enlarged central section of the automatic variable feed mechanism for the spindle head and shown in neutral position;

Fig. 8 is a perspective View of the shifting mechanism for the double friction clutch and the double jaw clutch;

Fig. 9 is an enlarged sectional side elevation of the yielding connection between the cam controlled rod and actuating arm of the clutch shifting mechanism;

Fig. ll) is an enlarged face view of the controlling cam of the automatic variable feed mechanism with the friction roller of the shifting device shown in section;

Fig. 11 is a cross section of the same and showing part of the clutch shifting mechainsm:

Fig. 12 is a sectional diagrammatic view of the automatic variable feed mechanism for the spindle head with the parts in position for moving the spindle head down to the work at a high speed;

Fig. l? is a similar view of the same with the parts in position during the drilling operation Fig. It is a similar view of the same with the parts in position for returning the spindle head quickly to starting position after the drilling operation is completed;

Fig. 15 is a diagrammatic plan view of the spindle head with the spindles arranged in a rectangular cluster; and

Fig. 16 is a similar view of the same with the spindles arranged in a circular cluster.

("e/20ml construction.

The multiple spindle drilling machine is mounted on a suitably constructed column or housing 24 provided with a base 21 and provided at the front with a vertical guideway 22 on which is mounted to slide up and down a spindle head 23. ()n the front lower portion of the spindle head 23 is arranged a rail 21 extending longitudinally and carrying detachable and adjustable bearings 23. in each of which is iournaled a drill spindle 26 adapted to carry a drilling tool :27 for drilling a hole in the work supported on the work support 28 arranged in front of the column 20 below the spindle head 23. As shown in Figs. l and 2. the bearings 23 and their spindles 26 are arranged one alongside the other and spaced equal distances apart. but the bearings and the spindles may be otherwise arranged according to the work in hand at the time. for instance. as shown in Fig. 17. in which the spindles are arranged in a rectangular cluster, or, as shown in Fig. 16, in which the spindles are disposed in a circular cluster, but it is evident that I do not limit myself to any one of the arrangements shown and described.

Variable speed changing mechanism.

The main shaft 40 is journaled in suitable bearings 41 arranged in a back gear housing 42 extending within the column 20, as plainly shown in Fig. 1. On the outer end of the main shaft 40 is secured a three-step cone pulley 43 connected by belt with other machinery for rotating the main shaft 40 at one of three different speeds according to the position of the belt on the corresponding step of the cone pulley 43 on the main shaft 40. lVithin the housing 42 are mounted to rotate loosely two gear wheels 45 and 46 of different diameters and provided with clutch members 47 and 48 adapted to be engaged by a double clutch 49 mounted to turn with and to slide lengthwise on the main shaft 40. Thus when the double clutch 49 is in engagement with. the clutch member 47 then a rotary motion is transmitted from the main shaft 40 to the gear wheel 45, and when the double clutch 49 is shifted into engage-- ment with the clutch member 48 then a rotary motion is transmitted from the main shaft 40 to the gear wheel 46, and when the double clutch 49 is shifted out of engagement with both clutch members 47 and 48 then it is in neutral or intermediate position and hence does not rotate either the gear wheel 45 or 46. In order to shift the double clutch 49 lengthwise on the main shaft 40 for the purpose mentioned, use is made of a shifting fork 59 engaging the double clutch 49 and attached to a transverse rocking shaft 51 journaled in suitable bearings 52 (see l 'ig. 2) arranged on the housing 42. One end of the shaft 51 extends through the lefthand wall of the column 20, and on the outer projecting end of the shaft 51 is secured a hand lever 53 adapted to be taken hold of by the attendant in charge of the machine. hen the double clutch 49 is in intermediate position. as shown in Fig. 1, then the lever has its handle disposed vertically, and when the lever 53 is swung upward from this position then the double clutch member 49 is moved in engagement with the clutch member 47, and when the lever is swung downward then the double clutch member 49 is moved in engagement with the clutch member 48.

The normally loose gear wheels 45 and 46 are in mesh with gear wheels 60, 61, keyed or otherwise fastened on a shaft 62 joun naled in suitable bearings 63 arranged within the housing 42. (See Fig. 1.) The gear wheels 45 and 69 are approximately of the same diameter to rotate the shaft 62 approximately at the same speed as that of the main shaft 40 at the time the double clutch 7 49 engages the clutch member 47 The gear wheel 61 is larger in diameter than the gear wheel 60, and its mate 46 is smaller than the gear wheel 45, and when the double clutch 49 isin engagement with the clutch member 48 then the shaft 62 is rotated at a lower speed but with increased power. By the arrangement described, the shaft 62 can be rotated at a higher or a lower rate of speed according to which of the gear wheels 60 or 61 is driven at the time from the main shaft 40 by the double clutch 49, as above explained. It will be noticed that the speed changing mechanism provides for six different speeds according to the position of the belt on the cone pulley 43 and the position of the double clutch 49 relative to the gear wheels 4:") and 46.

Spindle driving mechanism.

The spindles 26 are simultaneously rotated from the shaft 62 and for this purpose the following arrangement is made: One end of the shaft 62 projects into the column 20 and on this projecting end of the shaft is secured a bevel gear wheel 70 in mesh with a bevel gear wheel 71 secured on the lower end of a vertically disposed drive shaft 72 journaled in suitable bearings 73 arranged on the column 20. The upper portion of the shaft 72 extends slidingly through the top portion 74 of the spindle head 23 (see Fig. 4) and this portion of the shaft is provided with a keyway 75 slidingly engaged by a key 76 secured to a pinion 77 journaled in the top portion 74 of the spindle head'23. The pinion 77 is in mesh with an intermediate gear wheel 78 keyed or otherwise attached to a short shaft 79 journaled in the upper portion 74 of the spindle head 23. The gear wheel 78 is in mesh with a gear wheel 80 mounted to rotate loosely on the smooth upper portion 81 of a feed screw 82 screwing in a nut 83 attached to the spindle head 23 and extending with the lower portion of the spindle into a closed chamber 84 formed in the spindle head 23. It will he noticed that by the arrangement descrihcd the feed screw 82 is disposed above the work intermediate the drill spindles 26 and the guideways 22 on the column 20 and hence side thrust on the spindle head 23 and guideways 22, incident to the action of the drilling tools 27 in the work, is practically eliminated and the spindle head is maintained in true vertical alineinent on the guideways and up, as hereinafter more fully described under the head of Spindle head feed.

The gear wheel 80 (see Fig. 5) is in mesh with gear wheels 90 and 91 secured on the upper ends of two shafts 92, 93 journaled in suitable bearings arranged on a bracket 94 attached to the inside of the upper portion 74 of the spindle-head 23. (See Fig. 4.) The gear wheels 90 and 91 form parts of a gearing for rotating the several drill spindles 26 in unison and at the same speed, and for this purpose the upper end of each spindle 26 is connected by a universal joint 100 with a shaft 101 j ournaled in the bracket 94 and the bottom of the up er portion 74 of the spindle head 23. Eac shaft 101 is provided with a gear wheel 102 which forms part of the gearing above referred to and plainly shown in Fig. 5, so that further description of the same is not deemed necessary, it being. how ever, understood that the several shafts 101 and the spindles 26 are rotated simultaneously at the same speed and in the same direction. From the foregoin it will be seen that when the drive shaft 42 is rotated at any one of its six speeds then a corresponding rotary motion is given to the several drill spindles 26. Each universal joint 100 is provided with a link made in telescoping sections 110, 11.1 to render the link extensible. thus insuring a proper connection between the corresponding shaft 101 and its spindle 26.

Spindle [wad feed.

The feed screw 82 is rotated at varying speed from a feed shaft 120 journaled in a housing 121 extending within the column 20, above the housing 42. The smooth portion 81 of thefeed screw 82 is journaled in a bearing in the bracket 94 and extends through the top of the spindle head 23, and the upper end of the said smooth portion 81 of the feed screw 82 is journaled in a bearing 125 arranged in a housing or gear casing 126 mounted on top of the column 20. ()n the upper end of the feed screw 82 is secured a gear wheel 127 in mesh with an intermediate gear wheel 128 journaled in the housing 126 and in mesh with a gear wheel 129 secured on the upper end of an extension 130 of the feed shaft 120. (See Figs. 1 and 7.) It will be noticed that when the feed shaft 120 is rotated a rotary motion is transmitted by the gear wheels 129. 128 and 127 to the feed screw 82 screwing in the nut 83 attached to the spindle head 23. Thus the spindle head 23 is moved downward on rotating the feed screw 82 in one direction and returned to uppermost position on rotating the feed screw 82 in a reverse direction. During the downward movement. the feed screw 82 is rotated first at a high speed until the drilling tools 27 reach the work. and then a further downward feeding movement is given to the spindle head 23 at a slow or drilling speed, that is. during the time the drilling tools 27 drill the holes in the work. The return movement of the spindle head 23 is at a high speed on reversing the rotary motion of the feed screw 82 and turning the latter at a high speed. For this purpose use is made of an automatic variable feed mechanism arranged as follows. special reference being had to Figs. 1, 2. 3, 7. 10. 11 and 12.

Variable automatic feed mechanism.

011 the drive shaft 72 is secured a bevel gear wheel 140 in mesh with a bevel gear wheel 141 secured on the outer end of a shaft 142 journaled in one side of the housing 121 containing the automatic variable feed mechanism. On the shaft 142 within the housing 121 is secured a bevel gear wheel 143 in mesh at the top and bottom with bevel gear wheels 144 and 145 keyed or otherwise attached to and forming part of friction clutch members 146 147 mounted to rotate loosely on the feed shaft 120. The clutch members 146 and 147 are adapted to be engaged by friction clutch members 14 and 149 forming part of a double clutch 150 mounted to rotate with and to slide up and down on the feed shaft 120. It will be noticed that the gear wheels 1 44 and 14.) are rotated simultaneously but in opposite direc tions by the gear wheel 143. and when the double clutch 150 is in neutral position. that is. with the clutch members 148 and 149 simultaneously out of engagement with the clutch members 146 and 147 then the gear wheels 144 and 145 rotate loosely on the feed shaft 120. When the double clutch 151 i is moved downward to engage the clutch member 149 with the clutch member 147 then the gear wheel 145 and its clutch member 147 rotates the double clutch 150 and consequently the feed shaft 120 at a high speed and in a forward direction to move the spindle head 23 downward. When the double clutch 150 is moved from its neutral position upward to engage its clutch member 148 with the clutch member 146 of the gear wheel 144 then the latter rotates the double clutch 150 in the opposite direction, and with it the feed shaft 120 to move the spindle head 23 upward.

The bevel gear wheel 143 is also in mesh at one side with a bevel gear Wheel 160 secured on a shaft 161 journaled in the housing 121. and on the said shaft 161 is secured a gear wheel 162 in mesh with a gear wheel 163 secured on a shaft 164 journaled on the housing 121. On the shaft 164 is secured a gear wheel 16.? in mesh with a gear wheel 166 secured on a shaft 167 journaled in the housing 121. The shaft 167 is provided with a worm 168 in mesh with a worm wheel 16%) mounted to rotate loosely on the feed shaft 120. It will be noticed that by the gearing described the bevel gear wheel 143 imparts a slow rotary motion to the worm wheel 169. lVhen a special change in the feed is required different size gear wheels 165 and 166 are used to vary the ratio between the shafts 164 and 167. The gear wheels 165 and 166 can be readily removed and replaced by another pair of different diameters by way of a removable cover 122 on the housing 121. (See Fig. 1.) On the top of the worm wheel 169 is secured or formed a aw clutch memher 170 adapted to be engaged by a aw clutch member 171 forming part of a double jaw clutch 17 2 mounted to slide up and down and to turn loosely on the upper portion of the feed shaft 120. The double jaw clutch 172 is provided at the top with a jaw clutch member 173 adapted to engage a jaw clutch member 174 having its hub 175 fastened by pins 176 and 177 or other fastening means to the adjacent ends of the feed shaft 120 and to the extension 130.

The double clutches 150 and 172-move in unison in such a manner that, when in the neutral position shown in Fig. 7, the double clutch 150 is out of engagement with both clutch members 146 and 147 and the double clutch 172 is in engagement with the clutch member 174 and out of engagement with the clutch member 170 and hence the gear wheels 145, 146 and 169 run idle and the feed shaft 130 is at a standstill with the spindle head 23 in uppermost position. iVhen the double clutch members 150 and 172 are next moved downward by the operator into the position shown in Fig. 12 then the double clutch member 150 moves into engagement with the clutch member 147 of the bevel gear wheel 145 and hence the feed shaft 120 is rotated at a high speed in a forward direction whereby the spindle head is fed downward at a high speed until the drilling tools 27 reach the work. The downward movement of the double rlutch 172 merely moves the clutch member 17 3 out of the clutch member 174 and the clutch member 171 into engage- -ment with the clutch member 170 whereby the clutch member 17 2, which is loose on the feed shaft 120, merely rotates with the gear wheel 169, likewise loose on the shaft 120.

When the drilling tools reach the work the double clutch members 150 and 172 are moved automatically upward. as hereinafter more fully described, into an approximately midway position, as shown in Fig. 13, whereby the double clutch 150 moves into neutral position relative to the clutch members 146 and 147. and the forward friction drive of the shaft 120 now ceases. By the upward movement of the doubleclutch 172 into the midway position, the clutch memher 171 remains in engagement with the clutch member 170 while the clutch member 173 is moved into engagement with the clutch member 174 and hence the double clutch 172 is in engagement with both clutch members 170 and 174 and the feed shaft 120 is positively driven in a forward direction at a slow speed from the gear wheel 169. The spindle head 23 is now fed slowly farther downward, that is, during the time the drilling tools 27 are drilling the holes in the work. When the holes have been drilled to the desired depth then the double friction clutches 150 and 172 are again automatically shifted in an upward direction into the position shown in Fig. 14 whereby the clutch member 171 of the double clutch 172 is moved out of engagement with the clutch member 170 and hence slow rotation of the feed shaft 120 ceases. The double clutch 150 during its upward movement engages its double clutch member 148 with the clutch member 146 of the bevel gear wheel 144 and hence the feed shaft 120 is now rotated by a friction drive at a high speed and in a reverse direction whereby the spindle head 23 is moved at a high speed upward to starting position, and when this position is reached the double clutches 150 and 172 are moved automatically downward a very short distance into the neutral position above described and shown in Fig. 7. The rotary movement of the feed shaft now ceases.

In order to actuate the double clutches 150 and 172 simultaneously, the following arrangement is made: The double clutch 150 is provided with a shifting collar 190 engaged by a shifting fork 191 secured to a shifting ever 192 journaled in suitable bearings arranged in the housing 121. On the shaft 192 is secured an arm 193 connected by a link 194 with an arm 195 secured on a shifting shaft 196 journaled in the housing 121. On the shaft 196 is secured a shifting fork 197 engaging an annular groove 198 formed in the double jaw clutch 172. On the shaft 196 is secured an arm 200 connected by a link 201 with an arm 202 secured on a shaft 203 journaled in the column 20 and extending at one end to the outside thereof, as plainly indicated in Figs. 1 and 3. On the outer end of the shaft 203 is securedan arm 204 adapted to be actuated by hand and automatically by a cam device, as hereinafter more fully described. It will be noticed that when a downward swinging motion is given to the arm 204 then a like downward movement is given simultaneously to the shifting forks 197 and 191 by the shifting mechanism just described to simultaneously move the double clutches 17 2 to correspondingly move the double clutches 17 2 and 150 in an upward direction.

A spring 210 (see Fig. 7) is used for pressing the connected double clutch memhere 150 and 172 in an upward direction,

and this spring 210 is arranged in the lower hollow portion of the feed shaft 120. The upper end of the spring presses against a block 211 mounted to slide in the shaft 120, and the block 211 is provided with a pin 212 extending into a vertical slot 213 formed in the feed shaft 120. The block 211 is 1'0- vided with a depending rod 214 exten ing through the spring 210 and slidingly engaging a screw plug 215 forming a seat for the lower end of the spring 210 and screwing in the lower end of the shaft 120. By screwing the plug 215 farther up or farther down in the shaft 120 the tension of the spring 210 can be increased or diminished to insure proper working of the double cams 150 and 172.

The outer end of the arm 204 is in the form of an eye 220 through which extends a rod 221 mounted to slide u and down at its lower end in a bearing 222 attached to the outside of the column 20. (See Fig. 1.) The rod 221 is provided at its upper portion with an inverted cup-shaped member 223 mounted to slide in a cylindrical bearing 224 likewise secured to the outside of the column 20. In this hearing 224 is arranged a spring 225 seated at its lower end on the bottom of the bearing 224 and pressing at its upper end against the member 223 to exert an upward ressure on the rod 221. The member 223 a uts against a nut 226 secured on the rod 221, and a sprin 227 is coiled on the rod 221 and is seate on the nut 226. The upper end of the spring 227 abuts against a washer 228 engaging the under side of the eye 220. The top of the eve 220 is engaged by a washer 229 pressed on by a spring 230 coiled on the rod 221 and abutting against the under side of a nut 231. It will be noticed that by the arrangement described the rod 221 is yieldingly mounted to slide up and down, and the rod 221 is yieldingly connected with the arm 204 controlling the double clutch shifting mechanism.

The rod 221 is provided above the bearin 222 with a head 240 pivotally connected wit the forked end 241 of a hand lever 242 fulcrumed on. a stud 243 attached to the column 20. The hand lever 242 extends to the front of the machine and is manipulated by the attendant of the machine to swing the lever 242 upward with a view to move the rod 221 downward to shift the double clutches 150 and 172 from the neutral position shown in Fig. 7 to the fast down feeding position shown. in Fig. 11.

In the head 240 is mounted to slide a stud 250- on which is journaled a friction roller 251 engaging an oscillating cam 252 which automatically controls the further movement of the rod 221 and consequently the automatic feeding movement of the double clutches 150- and 172. The cam 252 is constructed as follows, special reference being had to Figs. 1, 2, 3, 7, 10, 11, 12, 13 and 14: The cam 252 is slowly driven from the feed shaft 120 and for this purpose the cam 252 is secured on a shaft 253 journaled on the column 20 and projecting into the same. On the shaft 253 within the column 20 is secured a worm wheel 254 (see Fig. 3) in mesh with a worm 255 secured on an. upright shaft 256 journaled in the housing 121. (See Fig. 7.) The lower end of the shaft 256 is provided with a gear wheel 257 in mesh with an intermediate gear wheel 258 journaled on a stud 259 attached to the rousing 121. The intermediate gear wheel 258 is in mesh with a gear wheel 260 secured on the lower end of the feed shaft 120 and hence when the latter is rotated in either a forward or reverse direction, as above described, then a corresponding turning movement is given to the cam 252 by the gearing just described. It is understood that in its extreme turning movement the cam 252 makes less than one complete revolution. The cam 252 has its body 270 of disk form and provided with two concentric T-slots 271 and 272, of which the outermost slot 271 is provided with two clamping bolts 273 and 274 engaging a cam segment 275 fitting against a circular shoulder 276 formed on the body 270 of the cam 252. The cam segment 275 is provided at its rear end with a segmental guideway 277 for the passage of the friction roller 251, and spaced from the exit end of this guideway 277 is formed an inclined cam member 278 for directing the friction roller 251 inv a downward direction after leaving the guidway 277. The rear end of the guideway 277 is in alinement with the radial rear end of the cam segment 275 and this rear end of the cam segment 275 directs the friction roller 251 onto a projecting portion 279 of the shoulder 276. The rear end of the cam segment 275 is spaced from the end 280 of the shoulder 276 a predetermined distance according to the depth of the hole to be bored. Thus for a deep hole to be bored, the length of the projecting portion 279 is increased by correspondingly adjusting the cam segment 275 forwardly on the face of the body 270 of the cam 252, and for boring a hole of less depth, the length of the aforesaid projecting portion 279 is decreased on correspondingly adjusting the cam segment 27 5 rear wardly. It is understood that for adjusting the cam segment 275 it is only necessary for the operator to loosen. the bolts 273 and 274 to allow of turning the cam segment 275 on the face of the body 270 of the cam 252, and after the desired position is reached the bolts 273 and 274 are screwed up to fasten the cam segment 275 in place. The friction roller 251 after travellng on the exposed portion 279 of the shoulder 276 drops off the end 280 and moves radially inward into the path of an inclined portion 281 formed on the face of the shoulder 27 6 adjacent the end 280, thus causing the friction roller to travel onto the face of the shoulder 276 during the reverse movement of the cam 252, as indicated in Fig. 141. In order to guide the friction roller 251 during this upward movement use is made of a guard 282 held adjustable on the face of the-body 270 by clamping bolts 283 engaging the T- slot 271. It is understood that the shoulder 276 has a cut-out portion 284 for the travel" of the friction roller 251 but the inner end of this cut-out portion is closed by a closing piece 285 fastened in place by clamp-' ing screws 286 engaging the T-slot 272. The friction roller 251 after passingalong the incline 281 onto the face of the shoulder 276 is in. the path of a disk cam 290 screwed on a stud bolt 29]. adjustably mounted in the T-slot 272. This disk cam 290 moves the friction roller 251 a short distance downward into the position shown in dotted lines in Fig. 10 whereby the rod 221 is correspond-' ingly shifted to move the double clutches 150 and 172 into neutral position, shown in Fig. 7.

In order to start the downwarifl feeding of the spindle head 23 the operator manipulates the hand lever 2 12 to move the friction roller 251 from the face of the cam body 270 to the peripheral face of the cam segment 2 5, and in order to accomplish this-result without the friction roller traveling on the face of the cam body 270 the friction roller 251 is temporarily withdrawn and for this purpose the following arrangement is made: The stud. 250 carrying: the friction roller 251. is mounted to slide in the head 24,0 and is pressed on by a spring 300 arranged in a bore 301 formed in the head 210, as plainly shown in 1].. The outer end of the stud 250 is provided with a head 302 pivotally connected with a bell crank lever 30 (see Fig. 3) fulcrumed on the head 2410 and connected by a link 30% with a hand lever 305 (see Fig. l.) fulcrumed at 806 on the handle end of the hand lever 2412. (in pressing the lever 30 1: toward the handle of the hand lever 242 the stud 250 is caused to slide in the head 24-0 against the tension of the spring 300 and this sliding movement of the stud 250 causes the friction roller 251 to move a short distance away from the face of the body 270 of the cam 252. The operator then imparts a swinging); motion to the lever 242 in an upward direction to impart a downward sliding movement to the rod 221 whereby the friction roller 251 is moved from the disk cam 290 downwardly until the friction roller 251iust clears the peripheral face of the cam segment 275. 'The operator new releases the hand lever 305 to allow the spring 300 to move the stud back to its normal position thereby carrying the friction roller 251 into position at the peripheral face of the cam segment 275. It is understood that when this movement hr s been completed the operator releases the hand lever 2452 and as the friction clutch. member 1119 is now in engagement with the clutch. member 147 a rotary motion is given to the feed shaft 120, as previously explained, and this rotary motion is transmitted to the cam 252 to rotate the latter in the direction of the arrow shown in l igs. 10, 12 and 13. The friction roller 251 now' travels on the peripheral face of the cam' segn'ient 275 and thereby holds the double friction clutches 150 and 172 in the position shown in Fig. 12 until the friction roller drops off the end of the cam segment onto the projecting portion 279 of the shoulder 276. It is understood that the spring exerts an upward pressure on the rod 221 so that the friction roller 251 is moved inward on the cam 252 as soon as it leaves the guideway 277, and this upward movement of the rod 221 causes a shifting of the douhleclutches 150 and 172 from the position shown in l 12 t0 the position shown in Fig. 13, whereby the feed shaft 120 is 1'0- tated in a forward direction but at a slow speed, and this rotation of the feed shaft 120 is continued until the friction. roller 251 drops off the end 280 of the exposed portion 279 of the shoulder 2'76. and a further upward movement is given to the-rod 221 by its spring: 225 to move the double friction clutches. 150 and 17 2'from the position shown in Fig: 13 to that shown in Fig. 14 .to cause the feed shaft 120 to turn in a reverse direction and at a hisrh speed. during the time the friction roller 251 travels up the incline 281 and along: the face of the shoulder 276 until pushed a short distance downward by the action of the disk cam 290. By this movement the friction roller 251 is moved to the position shown in dotted lines in Fig. 10 and the double clutches 150 and 1.72 are re turned to the neutral position illustrated in Fin. 7. lt understood that the spring 225 assists the spring 210 in exerting an upward pressure on the double clutch shifting mechanism with a view to hold the friction roller 251 in engagement with the peripheral face of the cam segment 275 and to move the rod upward at the time the rear end of the cam segment 275 reaches a lowermost position and the friction roller 251. leaves the said rear end of the cam segment 275 and passes onto the exposed or projecting portion 279 of the shoulder 27 6. against which the friction roller is held by the action of the springs 225 and 210. When the rear end 280 of the portion 27 9 reaches a lowermost position the rod 221 is pushed further upward by the action of the springs 225 and 210 until the f; ion roller 251 is opposite the inclined cam face 281, it being understood that at this time the double clutches 150 and 172 are in their extreme uppermost positions. (See Fig. 14.) When the friction roller 251 is next engaged by the disk cam 290 moving into a lowermost position the rod 221 is pulled downward a short distance against the tension of the springs 225 and 210 to move the double friction clutches 150 and 172 into the neutral position shown in Fig. 7. T he friction roller 251 is held against the disk cam 290 by the action of the springs and 210 until the rod 221 is moved downward bv the operator manipulating the lever From the foregoing it will be seen that by adjusting the cam segment 275 and the disk cam 291) on the body 270 of the cam 252 any desired feed can be given to the spindle head 23, that is. by adjusting the cam segment 275 the spindle head 23 is moved from its normal uppermost position downward at a high speed until the drilling tools 27 reach the work. and then the s indle head 23 is further fed downward at a s ow speed until the drilling tools 27 have bored holes to a desired depth, after which the spindle head 23 is quickly returned to its uppermost position whereby the drilling tools 27 move out of the drilled holes a distance above the work to allow convenient subsequent removal of the work without interference by the drilling tools. It is understood that the operator only mani ulates the levers 305 and 242 for temporari y withdrawing the friction roller 251 from the cam 252 and moving the rod 221 a short distance downward. as previously explained. to start the feed shaft 120. after which the remaining operations are completely automatic by the action of the cam 252 on the friction roller 251 mounted on the rod 221.

Hand feed.

In order to turn the feed shaft 120 and consequently the feed screw 82 by hand whenever it is desired to do so, the followin arrangement is made, special reference being had to Figs 1, 2, 3, 6 and 7. On the extension 130 of the feed shaft 120 is keyed or otherwise secured a helical gear wheel 310 in mesh with a helical pinion 311 secured on a shaft 312 journaled in a suitable bearing 313 held on a late 314 attached in the column 20. (See ig. 6.) The outer end of the shaft 312 is provided with a clutch member 315 adapted to be engaged by a clutch member 316 keyed or otherwise secured to the inner end of a shaft 317 mounted to turn and to slide in a bearing 318 formed on a cap 319 fastened to the plate 314. On the shaft 317 is secured a hub 320 provided with hand spokes 321 to permit the operator to conveniently and powerfully turn the shaft 317. Between the hub 320 and the bearing 318 is arranged a cam 325 mounted to turn on the shaft 317 and having a cam face 326 adapted to engage a cam groove 327 formed in the outer end of the bearing 318. (See Figs. 2 and 6.) On the cam 325 is secured a handle 328 adapted to be taken hold of by the operatorto turn the cam 325 with a view to disengage the cam face 326 from the cam groove 327 thus moving the hub 320 and consequently the shaft 317 in an outward direction to disengage the clutch member 316 from the clutch member 315. The shaft 317 is held in this inactive normal position while the automatic feed mechanism is in use and hence the shaft 317 is not turned from the extension 130 of the feed shaft 120 when the latter is rotated and with it the shaft 312 connected by the spiral pinion 311 and the spiral gear wheels 310 with the extension 130 of the'feed shaft 120.

The outer portion of the shaft 317 is pro vided with a recess 330 in which is arranged a spring 331 coiled around a rod 332 extending through a reduced bore 333 in the inner end of the shaft 317. The rear threaded end 334 of the rod 332 screws centrally into the shaft 312. The outer end of the rod 332 is provided with a head 335 against which abuts the outer end of the spring 331 thus causing the latter to exert an inward pressure on the shaft 317 and hence when the cam 325 is turned and its cam face 326 moves in register with the cam groove 327 then the shaft 317 is moved inwardly by the action of the spring 331 to engage the clutch member 316 with the clutch member 315. The shaft. 317 is now connected with the shaft 312 and the latter can be turned by the operator turning the shaft 317. The shaft 317 can only be moved inwardly to engage the clutch member 316 with the clutch member 315 at the time the automatic variable feed mechanism is in neutral position and for this purpose the following arrangement is made: On the clutch member 316 is formed a disk flange 340 normally engaged at its inner face by an arm 341 secured on the shaft 203 forming part of the double clutch shifting mechanism above described. the arm 341 is in engagement with the inner face of the disk 316 as long as the clutches 150 and 172 are in active position and hence the Shaft 317 is held in outermost position with the clutch member 316 out of engagc ment with the clutch member 315. as shown in Fig. 3. When the clutch shifting mechanism is moved into neutral position then the rocking movement of the shaft 203 swings the arm 34] into registering position with the peripheral face of the disk flange 340 to allow the shaft 317 to be shifted in an inward direction on the operator correspond ingly turning the cam 325 to move its cam face 326 in register with the cam groove 327 to allow the spring 331 to shift the shaft 317 inwardly with a view to engage the clutch member 316 with the clutch member 315. It is understood that the outer end of the arm 341 is made segmental to correspond to the peripheral face of the flange disk 340 and hence when this segmental edge is in register with-the peripheral face of the disk 340 the latter can move inward with the shaft 317 as described. It is expressly understood. that the arm 341 only moves in registering position with the cam disk 340 at the time the double clutches 150 and 172 are in neutral position and consequently the feed shaft 120 can now be turned by the operatorturningthe shaft317 to feed the spindle head 23 downward or upward according to the direction in which the shaft 317 is turned at the time. It will further be noticed that as long as the arm 341 is in registering position with the disk flange 340 the shaft 203 is prevented from being turned and consequently the shifting mechanism for the double clutch cannot be actuated until the shaft 317 is returned to outermost position by the operator correspondingly turning the cam 325 to move the cam disk 340 out of engagement with the cam disk 341. From the foregoing it will be seen that the hand feed mechanism cannot be actuated as long as the automatic feed mechanism is in action and the latter cannot be moved out of neutral position as long as the hand feed is in action.

lVorlc support.

The work support 28 is in the form of a bed-common to all the drilling tools 27, and

the said support is provided with bearings 350 mounted to slide up and down on the vertical guideways 22 on which the spindle head 23 is mounted to slide up and down. The support 28 is supported on the upper end of a screw rod 351 screwing in a nut 352 attached to the base 21 of the column 20, and

on the said screw rod 351 is secured a worm wheel 353 in mesh with a worm 354 (see stood that the up and down movement of the screw rod 351 causes the raising or lowering of the work support 28 to move the work in proper relation to the drilling tools 27.

027mg system.

The speed changing mechanism in the housing 42 and the automatic variable feed merhanism in the housing 121 are oiled by splash systems on filling the housings with 8.

lubricating oil. The mechanisms in the top 7 4 of the spindle head are lubricated in the following manner: The top portion 74 of the spindle head 23 forms an oil well contalnmg a liquid lubricant, the level of which is shown by a suitable glass gage 360 attaehed to the front of the top portion 74, as plainly shown in Figs. 1. 2 and 4. Into the oil well extends the suction pipe 370 (see Fig. 4) of a pump 371, preferably of the rotary type, and mounted in a top piece 372 forming a part of the top portion74 inclosed by a cover The pump 37]. has its discharge pipe 374 discharging the oil into a shallow reservoir 375 formed in the top piece 372 and this reservoir 375 is provided with an overflow 376 located directly above the meshing teeth of the gear wheels 78 and 80 by which the lubricant distributed to the other gear wheels in the top portion 74 and shown in Figs. 4 and 5. It is understood that the oil in the oil well of the top portion 74 lubricates the feed screw 82 and its nut 83 and also supplies lubricant to the shaft 121 connected with the drill spindles 26, and the oil passing from the reservoir 375 into the upper this shaft-is secured a pinion 378 in mesh with the gear wheel 80 so that when the latter is rotated the rotary motion is given to the pinion 378 to actuate the pump for circulating the oil as above explained.

In order to lubricate each. of the drilling tools 27 during the drilling operation thereof., any desired lubricating means may be used.

The operation is as follows:

The work to be drilled is fastened on the top of the work support 28 in the usual manner. and the work support is raised or lowered according to the height of the work, that is to say, that the top of the work clears the lower ends of the drilling tools 27 to permit of conveniently placing similar pieces of work on to the work support or removing the same therefrom. In order to obtain the desired speed, the operator correspondingly adjusts the lever 53 to shiftthe double clutch -49 correspondingly, as previously explained operator manipulating the hand lever 305 as above explained. The downward movement of the rod 221 causes the double' clutch 150 to move in engagement with the clutch member 14? of the bevel gear wheel 115 to rotate the feed shaft 120 forwardly at a high speed to cause the spindle head 23 to be quickly moved downward until the drilling tools 27 reach the work. At this time the friction roller 251 moves oil the rear end of the cam segment 275cm to the projecting or exposed portion 279 of the shoulder 276 whereby the double clutch 150 is moved into neutral position, shown in Fig. 13, while the double jaw clutch 172 engages both jaw clutch members 170 and 174 to rotate the feed shaft 120 forwardly and positively at a reduced or drilling speed. The drilling tools 27 now drill holes in: the work and when the holes have been'drilled'to the desired depth then the friction roller 251 moves off the end 280and upwardly into the'position shown in Fig. 14 whereby the double jaw clutch 172 is moved out of engagement with the clutch member 17 0 of the worm wheel 169 while the double clutch 1 50 is moved into engagement with the clutch member 146 of the gear wheel 144, and hence the feed shaft 120 is rotated at a high speed in a reverse direction to'return the spindle head 23 'to its uppermost startingposition. When the spindle head 23 moves into uppermost position the disk cam 290 engages the friction roller 251 and pushes the same a short distance downward and with it the rod 221 to return the clutch mechanism to the normal position shown in Fig. 7 thus stopping further rotation of the feed shaft 120. From the foregoing it will be seenithat by the arrangement 'described a number of dri'llingoperationsare carried on simultaneously: and 'an automatic advance feed and returno f the drill spindles is had thus -insuring high production without requiring attention on, the partof the attendant except for the 'latter -'to place the work in position, starting the maio'liiiieiand removing the work after it is finished. A

Having thus described my invention, 1" claim as new and desire to secure by Letters Patehtih J.

,1. *mifltipie'drilling machine. a main" su on, a spindle head mountedto slide up nifdwimn the said main support. a vertical drive shaftfj'ou-rnaled in the said main support, a connecting gear arranged in the said spindle drii e shaft was the;'d is'ill spindles. a ver-' tical feediserew journaled in 'thesaid main support and screwing in the said spindle. head "to. raise or lower the; latteina vertical feed shaft journaled'in thesaid mainlsupport; a aring connecting the said =eed shaft wi ead and connecting the said -'-the said'feed'screw, and a variable aut'finiatlc', feed mechanism connected with" the ifid feclelia ft and driven f-rom the drive shaft to rotate the said feed shaft first at a high speed to quickly advance the drill spindles to the work, to then rotate the feed shaft at a reduced working speed and to finally rotate the feed shaft at a high re- 70 turn speed to return the quickly to starting position.

2. In a multiple drilling machine, a main support, a spindle head mounted toslide up drill spindles and down on the said main support, a vertical drive shaft journaled in the said main. support, a variable speed driving gear connected with the said drive shaft to rotate the latter at different speeds, a connecting the latter, a vertical iced shaft journaled in the said main support. a gearing connecting the said feed shaft with the said feed screw, and a variable automatic feed mechanism connected with the said feed shaft and driven from the said drive shaft to ro- J tate the said feed shaft first at a high speed to quickly advance the drill spindles to the Work, to then rotate the feed shaft at a reduced working speed and to finally rotate the feed shaft at a high return speed-to return the drill spindles quickly to starting position.

3. In a drilling'machine, a spindle head" mounted to move up and down, and a variable feed mechanism for feeding the said 109 spindle head down and up, the said feed mechanism having a feed shaft, fast forward feeding means for rotating the said feed shaft forwardly at ahi'gh speed to move" the spindle head to the work. slow speed 109 feeding means for rotating the said feed shaft forwardly at a slow speed 'during the drilling of the work, fast return feeding means for rotating the said'feed shaft in a reverse direction to return the spindle 9 head 'at high speed to starting position, an

. oscillating cam driven from the said' feed shaft and provided with adjustable devices, of which one is for setting the cam for controlling the total travel of the spindle head, 2;;

and th other is for setting the cam for varying the working travel of the'spindle head, and means connecting the said camwith the said fast forward feeding means, the said slow speed feedingme'ans'and the-said fast 1%;

return feeding means. i

4. In a drilling machine, a spindle head mounted to move downa'nd'up and a variable feed inechanismfor feeding the spindle head down and up, the said feed mechanism '22 having a feed shaft. oppositely disposed clutch gear wheels, mounted loosely onth' said feed shaft, a driven gear-wheel in mesh with the said clutch gear wheels. a double l-uteh -rotating ,with awwe feed 411m. lea

and adapted to engage either of the said clutch gear wheels to rotate the said feed shaft at a high speed either forward or backward, a slow Speed gearing driven from the said driven gear wheel and having a clutch wheel loose on the said feed shaft, a clutch mechanism connected with the said shaft and adapted to engage the said low speed clutch wheel, and means to actuate the said double clutch and the said clutch mechanism to rotate the said feed shaft successively at a high speed in one direction, at a low speed in the same direction and at a high speed in the opposite direction.

5. In a drilling machine, a spindle head mounted to move up and down, and a variable feed mechanism for feeding the said spindle head up and down, the said feed mechannism having a feed shaft, a driven gear wheel. clutch gear wheels loose on the said feed shaft and in mesh with the said driven gear wheels at diametrically opposite points to rotate the said clutch gear wheels in opposite directions, a double clutch member rotating with the feed shaft and adapted to engage either clutch gear wheel, a slow driving gearing having one wheel in mesh with the said driven gear wheel and having another wheel provided with a clutch member and mounted loosely on the feed shaft, a clutch mechanism having a fast and a loose clutch member on the said feed shaft, the said loose clutch member being adapted to engage the fast member or the said slow drive clutch wheel, and a connection between the said double clutch member and the said loose clutch member to actuate the clutch members in unison to rotate the feed shaft at a high speed either forward or backward, and at a slow speed in a forward direction.

6. In a drilling machine, a spindle head mounted to move up and down, and a variable feed mechanism for feeding the said spindle head up and down, the said feed mechanism having a feed shaft, a driven gear wheel, clutch gear wheels loose on the said feed shaft and in mesh with the said driven gear wheels at diametrically opposite points to rotate the said clutch gear wheels in opposite directions, a double clutch member rotating with the feed shaft and adapted to engage either clutch gear wheel, a slow driving gearing having one wheel in mesh with the said driven gear wheel and having another wheel provided with a clutch member and mounted loosely on the feed shaft, a clutch mechanism having a fast and a loose clutch member on the said feed shaft, the said loose clutch member being adapted to engage the fast member on the said slow drive clutch wheel, and a connection between the said double clutch member and the said loose clutch member to actuate the clutch members in unison to rotate the feed Shaft at a high speed either forward or backward and at a slow speed in a forward direction, an adjustable oscillating cam driven from the said feed shaft, and a connection between the said cam and one of the said shiftable clutch members to actuate the clutch members in unison.

7. In a drilling machine, a variable feed mechanism, comprising a feed shaft, a pair of high speed clutch wheels mounted to turn loosely on the said feed shaft and driven in opposite directions at a high speed, a low speed clutch wheel mounted to turn loosely on the said feed shaft at a low speed, a double clutch member slidable on the said feed shaft and rotating therewith, the said double clutch member being adapted to engage either of the said high speed clutch wheels, a fixed clutch member on the said feed shaft, a second double clutch member slidable and rotating loosely on the said feed shaft and adapted to simultaneously engage both the said fixed clutch member and the said low speed clutch member or to engage either of them, and cam controlled means moving the said slidable double clutch members in unison to rotate the said shaft at a high speed in one direction, then at a low speed in the same direction and finally at a highspeed in a reverse direction.

8. In a drilling machine, a variable feed mechanism, comprising a feed shaft, a pair of high speed clutch wheels mounted to turn loosely on the said feed shaft and driven in opposite directions at a-high speed, a low speed clutch wheel mounted to turn loosely on the said feed shaft at a low speed, a double clutch member slidable on the said feed shaft and rotating therewith, the said double clutch member being adapted to en-v gage either of the said high speed clutch wheels, a fixed clutch member on the said feed shaft, a second double clutch member slidable and rotating loosely on the said feed shaft and adapted to simultaneously engage both the said fixed clutch member and the said low speed clutch member, or to engage either of them, an oscillating cam driven from the said feed shaft and provided with two adjustable devices, and shifting means connected with the said slidable double clutch members to actuate the same in unifeed shaft, a second double clutch member slidable and rotating loosely on the said feed shaft and adapted to simultaneously engage both the said fixed clutch member and the said low speed clutch member or to engage either of them, an oscillating cam driven from the said feed shaft and provided with two adjustable devices. shifting means connected with the said slidable double clutch members to actuate the same in unison, the said shifting means being controlled by the said adjustable cam devices, and a hand lever connected with the said shifting means to move the latter from normal neutral position into active position.

10. In a drilling machine, a variable feed mechanism, comprising a feed shaft, a pair of high speed clutch wheels mounted to turn loosely on the said feed shaft and driven in opposite directions at a high speed, a low speed clutch wheel mounted to turn loosely on the said feed shaft at a low speed, a double clutch member slidable on the said feed shaft and rotating therewith, the said double clutch member being adapted to engage either of the said high speed clutch wheels, a fixed clutch member on the said feed shaft, a second double clutch member slidable and rotating loosely on the saidfeed shaft and adapted to simultaneously engage both the said fixed clutch member and the said low speed clutch member or to engage either of them, a cam driven from the said feed shaft and provided with two independently adjustable devices, and a shifting rod connected with the said slidable double clutch members to actuate the same in unison, the said shifting rod having a friction roller adapted to be successively engaged by the said cam devices.

11. In a drilling machine, a variable feed mechanism, comprising a feed shaft, a pair of high speed clutch wheels mounted to turn loosely on the said feed shaft and driven in opposite directions at a high speed, a low speed clutch wheel mounted to turn loosely on the said feed shaft at a low speed, a double clutch member slidable on the said feed shaft and rotating therewith. the said double clutch member being adapted to engage either of the said high speed clutch wheels, a fixed clutch member on the said feed shaft, a second double clutch member slidable and rotating loosely on the said feed shaft and adapted to simultaneously engage both the said fixed clutch member and the said low speed clutch member or to engage either of them, an oscillating cam driven from the said feed shaft and provided with an adjustable peripheral device and an adjustable face device. a shifting rod connected with the slidable double clutch members to actuate the same in unison, a stud slidable on the said shifting rod and carrying a friction roller adapted to be engaged successivelyaby the said. cam devices, a

hand lever connected with the said shifting rod, and a withdrawing lever connected with the said stud to temporarily withdraw the friction roller from the face of the cam while moving the friction roller from neutral to active position on operating the said hand lever.

12-. In a drilling machine a feed shaft, an automatic variable power feed mechanism for driving the said feed shaft at varying speeds and in a forward or in a reverse di rection, a hand feed shaft mounted to turn and to slide and under the control of an operator, the said hand feed shaft being provided with a clutch member, a stub shaft provided with a clutch member adapted to be engaged by the said clutch member on the hand feed shaft, a gearing connecting the said stub shaft with the said feed shaft, a retaining flange on the said hand feed shaft. and a locking arm controlled by the said antomatic variable feed mechanism and extending into the path of the said flange at the time the said automatic variable feed mechanism is in action to hold the hand feed shaft out of engagement with the stub shaft, the said locking arm being out of the path of the said flange at the time the said automatic variable feed mechanism is in neutral inactive position.

13. In a drilling machine, a feed shaft, an

automatic variable power feed mechanism for driving the said feed shaft at varying speeds and in a forward or in a reverse direction, a hand feed shaft mounted to turn and to slide and under the control of an operator, the said hand feed shaft being provided with a clutch member, a stub shaft provided with a clutch member adapted to be engaged by the said clutch member on the hand fced shaft, a gearing connecting the said stub shaft with the said feed shaft, a retaining flange on the said hand feed sha t. a locking arm controlled by the said automatic variable feed mechanism and extending into the path of the said flange at the time the said automatic variable feed mechanism is in action to hold the hand feed shaft out of engagement with the stub shaft, the said locking arm being out of the path of the said flange at the time the said antomatic variable feed mechanism is in neutral inactive osition, and a. manually controlled cam mec anism engaging the said hand feed shaft to impart a sliding motion thereto to move the clutch members out of engagement.

14. In a drilling machine, a feed shaft, an automatic variable power feed mechanism for driving the said feed shaft at varying speeds and in a forward or in a reverse direction. a hand feed shaft mounted to turn and to slide and under the control of an operator, the said hand feed shaft being provided with a clutch member, a stub shaft provided with a clutchmember adapted to be engaged by the said clutch member on the said feed shaft, a gearing connecting the said stub shaft With the said feed shaft, a retaining flange on the said hand feed shaft, a locking arm controlled by the said automatic variable feed mechanism and extending into the path of the said flange at the time the said automatic variable feed mechanism is in action to hold the hand feed shaft out of engagement With the stub shaft, the said locking arm being out of the path of the said flange at the time the said automatic variable feed mechanism is in neutral inactive position, a manually controlled cam mechanism engaging the said hand feed shaft to impart a sliding motion thereto to move the clutch members out of engagement, and a spring pressing the said hand feed shaft to move the hand feed shaft into clutch engaging position.

WILLIAM F. McCARTY. 

